they are stock

 

Thank you all for your feed back I plan on getting to this weekend and getting it taken apart again and see what’s going on.

 

Did you change cams?

 

A true backfirwe...not a little sneeze...is usually a major vacuum leak...

 

Really bad leak... and/or ignition timed on rear cylinder, or... well.....if it was points I would say Condenser

 

yeah I’m not sure where. I felt pretty confident in getting the intake manifold on properly to the head and carb. But, I will be better able to see when I get it back apart again.

 

no I did not change the cam. I did not think I had to.

 

I’m not sure if this not relevant to the problem or this is contributing to the problem. But before I left for work this morning I went out and took a quick glance at it. I noticed that what I’m guessing is the voes ground wire, a black wire, is frayed and not attached. Would that not being grounded cause this to backfire like it is ?

 

Yes, but probably not to the point it'd blow flame out the carb. But that depends on how much throttle you're giving it and at what rpm when it's backfiring.

First, make sure that's not you horn wire laying frayed and un-hooked - it's black too.

Temporarily tie/run a jumper from that black wire to a ground (anywhere) and see what you get. But if runs/starts just sorta ok, go on and investigate the intake fittings etc. You don't want to run one lean from a bad intake leak, especially on break-in. You can overheat a cylinder(s) real quick and waste all the rebuild you just did.

 

okay will do thank you for your help.